Lifting-gear for spring-pressure safety-valves.



BAT-BNTED MAR. 31, 1903.

J. E. LONERGAN. LIFTING GEAR FOR SPRING PRESSURE SAFETY VALVES.

APPLICATION FILED JULY 2. 1902.

H0 MODEL.

JQZWZTZW' 3- 56 INITED STATES ATENT 0FFICE.

JOHN E. LONERGA'N, or PHILADELPHIA, PENNSYLVANIA.

SPEGIFIGAIION forming part of Letters Patent No. 724,304, dated. March31, 1903. Application filed July 2,1902. Serial No. 114,072. (No model.)

i against the under side of the head B, secured to the stem. Pivoted ate on the end'of this To all whom it may concern: 7

Be it known that I, JOHN E. LONERGAN, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Lifting-Gears for Spring- I jection on the casing O, andon this lever is Pressure Safety-Valves, of which the follow ing is aspecification. I

My invention relates to certainimprovements in lifting-gears forspring-pressure safety-valves and the object of my invention is toprovide means whereby the valve can be readily lifted a distance offitsseat against a the pressure of the spring when there is no pressureon the under side of'the valve to help lift it.

In the accompanying drawings, the figure is a vertical sectional viewshowing one form of spring-pressure safety-valve and illustrat ing myinvention.

A is the valve-casing.

a, is the valve, adapted to the usual seataf B. is a stem connected tothe valve and arranged to move in a bearing 0, formed in the cap C ofthe casing. This cap is secured to the casing A in any suitable manner.

In the present instance there are two springs D and D, one rectangularin cross-section and the other circular. The springs rest against aplate 0 at their upper ends and- This against a plate I) at their lowerends. plate has a spindle resting in a socket in the valve a, so thatwhen there is sufficient pressure under the valve in the direction ofthe arrow then the valve will be lifted ofi its seat and the springs D Dwill be compressed accordingly; but as soon as this pressure is relievedthe valve will immediately fall back to its seat.

Ordinarily very heavy springs are used in these spring-pressuresafety-valves. Consequently it is a difficult matter to lift the valveolf its seat by any mechanical means when there is no pressure ontheunder side of the valve to help raisethe valve.

By my invention I-am enabled to use a compact mechanical device whichwill not only lift the valve off its seat, but will lift it entirelyclear of its seat.

E is a lever pivoted ate to a projection on the cap 0. This leverextends across the valve-casing, spanning the valve-stem B and having anenlarged portion 6, which rests lever E is a segmental gear E, which ispivoted eccentrically to the lever E.

F is an operating-lever pivoted at f to a proasegmental gear F, which isalso arranged eccentrically to the pivot f, so that when the lever F isin the position shown in Fig. l the pivots f and e are close togetherand the valve is seated, but can raise off its seat when the pressureunder the valve becomes greater than the pressure of the springs withoutinterfering with the lever mechanism above described; but when theoperating-lever F is moved in the direction of its arrow then theeccentric gears F and E both turn on their 1 It will be noticed inreferring to the drawings that the pivot of the eccentric E is offset Inrespect to the pivot of the lever F, so that when the lever is turned upit will be held in its adjusted position, owing to the fact of beingthrown ofi center.

I have shown my invention applied to a certain form of spring-pressuresafety-valve but it will be understood that my invention may be appliedto other types of valves without departing from my invention.

I claim as my invention-- 1. In a liftinggear for springpressuresafety-valves, the combination of the casing, a valve, a valve-stem, aspring for keeping the valve to its seat, a lever pivoted to thevalve-casing and engaging the stem of the valve, a gear pivoted to thesaid lever, an operating-lever pivoted to the casing and having a gear,the teeth of which mesh with the teeth of the other gear, said gearsbeing eccentric, so that when motion is imparted to the handle the twogears will turn oh their pivots and raise the valve-stem against thepressure of the spring, substantially as described.

2. In a liftinggear for springpressure safety-valves, a spring-pressurevalve, its

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stem,with a lever acting against the stem,and an operating-lever pivotedtothe casing, with eccentric gears between the hand-lever and thevalve-lever for lifting the valve 01f its seat, substantially asdescribed.

3. The combination of a valve-casing having a valve-seat, a valve, astem, a spring tending to keep the valve to its seat, a head on thevalve-stem, a lever pivoted to the easing and resting under the head ofthe valvestem, an eccentric segmental gear pivoted to the outer end ofthe said lever, an operatinglever pivoted to the casing and havingformed thereon an eccentric segmental gear which meshes with the othergear so that when the lever is raised the valve will be lifted off itsseat against the pressure of the spring, substantially as described,

4. The combination of a valve-casing, a valve, a stem therefor, a leverconnected to the stem, means acting on the valve for keeping the same ina predetermined position, an eccentric gear rotatably mounted on thelever and an operating-lever having a portion formed to mesh with saidgear and pivoted to the casing, the relative mountings of the gear andthe operating-lever being such that the center of rotation of the gearis at a distance from the line of action of the means acting on thevalve different from that of the pivot 0f the operating-lever,substantially as described.

5. In a lifting -gear for spring-pressure safetyvalves, aspring-pressure valve, a stem therefor, a lever acting against the stemand an operating-lever pivoted to the casing with eccentric gearsbetween the latter lever and the valve-lever for liftingthe valve olfitsseat, said gears being so arranged that theircenters of rotation arenearest each other when the valve is closed, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN E. LONERGAN.

Witnesses:

WILL. A. BARR, J os. 11. KLEIN.

